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Cafergot, a popular migraine treatment, consists of some infinitismal amount of ergotamine tartrate, some small amount of caffeine and a bunch of inert ingredients. It's taken in pill form. The caffeine boosts the metabolism to uptake the ergotamine tartrate, which is used to handle the spasms that cause optical migraines, among other ailments. Prescribed regularly in the U.S., to be taken only during an attack.